Stereoscopic device.



J. R. PURVIS.

STEREOSGOPIG DEVICE. APPLICATION FILED F3344, 1912.

1,072,990. Patented sept. 9, 1913.

@NZH/wal? JosEPi R. PRv'S, or Non'woon GOVE, MANITQBA, CANADA.

sru'nnoscorre Davies.'

'specication er Letters raient.

Applicationy med February 14, 1912. serial No. 677,641.

Patente-d sep-tee, 191e.

To all whom t may concern.'y

Be it known that I, ,JOSEPH R. PURvIs, a subject of the King of Great Britain, residing at Norwood Grove, in the Province of Manitoba and Dominion of Canada, have invented new and useful Impipvements in Stereoscopic Devices, of which the following is la specification.

My present invention relates to improvements in shutters designed for use' with apparatus for exhibiting or viewing. what are known as motion pictures and other pictures ,of a like nature. A

In carrying out this invention, it is my purpose to provide a devicev 'of this type whereby the lines of vision of the right and left eyes of an observer may be alternately opened a-nd closed so that only one picture at a time will be seen, the shutter operating operation of the in synchronism with the picture projecting machine to obtain the desiredl result. Furthermore, I aim to provide a shutter of this type by means of which sight openings may vbe opened and closed alternately so as to presentJto the respective eyes of an observer only those pictures which are intended to be viewed by each eye.

The invention also involves the provision of means for actuating the shutter to alternately open and close the openings, and a mechanism for imparting movement to the meansiinitially and controlling the movement of such meansv subsequent to its initial operation so'as to insure the proper movement of the shutter with respect to the i picture projecting or eX- hibiting machine.'v

With the above objects in view vand others of a similar nature, the invention consists in the construction, combination and arrangement of parts hereinafter set forth in and A allingwithin the scope of the appended claims. t

In the accompanying drawings wherein has beenillustrate'd one embodiment of my invention: Figure l is a plan view of an apparatus constructed in accordance with the present `inventirmand Fig. 2is a similar view of a modified form ofthe invention. p

Similar reference `characters designate like. parts throughout the several views.

,Referring now to the drawingin detail,

my improved shutter in the present instance includes a base l constructed of wood or any other suitable materialv and-provided with eye openings 2, 2. spaced a sufficient distance from each other to accommodate the eyesofof the openings is completely closed the other will be completely open. The movable shutter 3 in this instance is designed to be reclprocated to effect the opening and closing of the eyev openings and to impart movement to the shutter for this purpose and tosupport thepsame upon the base in proximity to the sight openings, I have provided means which, in the present embodiment of the invention, comprises a pair of substantially elliptical springs` 4, 4 each iiXed at one point to the base as at 6 at a suit-able distance to one side of the eye open- `ings, and ata diametrically opposite point to one extremity of the-shutter 3 as at 7,

whereby the springs may act in opposi- V tion to each other yto vibrate the shutter with respect to the baseand alternately open and close the sight openings, and at the same time support the shutter upon the base.

-To impart initial movement to the shutter vand permit the springs to reciprocate the shutter, and also to control the movement of the shutter under the action of the springs so that the former may operate synchronously with the picture projecting machine, I have herein shown a solenoid? electrically connected with the picture machine, (not shown) and adapted to be energized from such machine to facilitate the movement of the shutter, a core or armature 8 being connected to the shutter 3 through the medium of a right angular arm -9 and operable to impart initial movement to the shutter and control the movement thereof from the solenoid.

From the above description taken in connection with the accompanying drawing, it will be seen that movement is first imparted to the shutter from the solenoid, conse- `quently placing the springs 4 under tension to vibrate the shutter across the sight openings to alternately open and close the said openings, the solenoid racting to controll the movement of the shutter under the; action of the springs and insure synchronism .of movement between the shutter and the picture projecting machine, and while li have herein showny anddescribed one form oflmy" myself to all of the details of the eonstruction' hereinA delineated, as modieation and variation may be made within the scope of the claims and without departing from the spirit of my invention'.

I claim l. AThe combination with a base provided with openings spaced apart, of a reciprocating. shutter adapted to open and close such openings alternately, and means for supporting and actuating said shutterlto alternately open and Close the openings, said i i,o72,99o l means including a device whereby impulses will be given to said-shutter periodically.

2. The combination with a base provided with openings, of p a' reciprocating shutter 20 adapted to'fopen and clo'se such openings alternately, ,and means including elliptical springs for supporting and actuating said' shutter to alternately open and close the openings, Y and a solenoid for giving im- 25 pulses to said shutter periodically. In testimony whereoi` I aix my signature in presence of two witnesses.

v. JOSEPH R. PURVIS. Witnesses:

LENAJAMIESON, y JN0. B. LEPEAN. 

